Merge branch 'patch-2' into 'master'

Update sign-up-newsletter-wordpress.md

See merge request extensions/form-processor!12

docs/sign-up-newsletter-wordpress.md

@@ -95,13 +95,13 @@ and the action is the *name* of your form processor.
 
 In the top of the form you see the short code which you can use to display the form on a page:
 
-![shortcode](images/newsletter-wp-contact-form-shortcode.png)
+![shortcode](/images/newsletter-wp-contact-form-shortcode.png)
 
 Copy this short code.
 
 It is time to create a page and paste our short code:
 
-![page](images/newsletter-wp-new-page.png)
+![page](/images/newsletter-wp-new-page.png)
 
 Save the page.